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Net Loss Per Common Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Outstanding Common Stock Equivalents Excluded From Diluted Net Loss Per Common Share The following
outstanding common stock equivalents have been excluded from diluted net loss per common share because their inclusion would be anti-dilutive:
 
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Shares of common stock subject to outstanding options3,842,026 4,823,917 3,893,173 4,792,022 
Employee stock purchase plan21,423 26,416 18,919 23,007 
Restricted stock units896,965 945,325 891,803 941,776 
Total common stock equivalents4,760,414 5,795,658 4,803,895 5,756,805